New Orleans is a major United States port and the largest city and metropolitan area in the state of Louisiana. New Orleans is located in southeastern Louisiana, straddling the Mississippi River. The city is named after Philippe d' Orl‚ans, Duke of Orl‚ans, Regent of France, and is well known for its distinct French Creole architecture, as well as its cross cultural and multilingual heritage. New Orleans is also famous for its cuisine, music (particularly as the birthplace of jazz), and its annual celebrations and festivals, most notably Mardi Gras. The city is often referred to as the "most unique" city in America.